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<br />i L <br />[~IGIiVFERING ACID f_NVIRC)~JMEI4TAl DIVISION <br />1475 PINE GROVE ROAD <br />P.O. ROX 774018 (303) 879-G?.GO <br />S TEA M60AT SPRINGS, CO (?0477 TELEX 510-100-3880 <br />March 8, 1988 <br />Mr. Craig Springer <br />Bear Coal Company <br />P.O. Box 518 <br />Somerset, Colorado 81434 <br />Dear Craig: <br />We have reviewed the laboratory data for Monitor Well AA-1 and have <br />reached the following conclusions. The era tic nature of the <br />conductivity and the TDS coupled with the related changes in calcium, <br />sodium, and sulfate indicate that representative ground water samples <br />are probably not being taken. This can result from one or more <br />reasons which include the following: <br />~ Well is silted in and should be redeveloped <br />e Sample taken without removing two (2) casing volumes from <br />the well and allowing well to T•e-charye prior to sampling <br />o Surface water and sediment from shale outcrops have <br />contaminated the well <br />Given one or more of these problems we suggest the following steps be <br />taken: <br />~ Redevelop the well by pumping and flushiny silt and sediment <br />from the casing to increase flow to well and allow <br />collection of representative ground water sample <br />u Pump well until field conductivity readings stabilize and <br />tYlen sample <br />e Bail well at sampling to evacuate two (2) casing volumes or <br />until conductivity stabilizes before sampling <br />~ Take extra care not to contaminate sample with silt and <br />sediment from well bottom <br /> <br />